M30620FCAFP datasheet(386/615 Pages) RENESAS

386 / 615 page

Clock-Synchronous Serial I/O

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-69

Example of wiring

Figure 2.4.13. Operation timing of reception in clock-synchronous serial I/O mode

1 / fEXT

Transmit enable

bit (TE)

Transmit buffer

empty flag (Tl)

CLKi

RxDi

Receive complete

flag (Rl)

RTSi

“H”

“L”

“0”

“1”

“0”

“1”

“0”

“1”

Receive enable

bit (RE)

“0”

“1”

The above timing applies to the following settings:

• External clock is selected.

• RTS function is selected.

• CLK polarity select bit = “0”.

fEXT: frequency of external clock

Make sure that the following conditions are met when

the CLKi pin input =“H” before data reception

• Transmit enable bit

→ “1”

• Receive enable bit

→ “1”

• Dummy data write to UARTi transmit buffer register

Receive interrupt

request bit (IR)

“0”

“1”

Cleared to “0” when interrupt request is accepted, or cleared by software

D0 D1 D2 D3

D4 D5 D6

D0 D1 D2

D3 D4 D5

Shown in ( ) are bit symbols.

Reception data is taken in

Transferred from UARTi receive register

to UARTi receive buffer register

(1) Reception enabled

(2) Start reception

(3) Reception is complete

Read out from UARTi receive buffer register

Transferred from UARTi transmit buffer register to UARTi transmit register

(4) Read of reception data

Dummy data is set in UARTi transmit buffer register

Example of operation

CLKi

RXDi

RTSi

CLK

TXD

Port

Microcomputer

Transmitter side IC

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